Steam-generator.



Patented IuIy I5, I902.

3 Sheets-Sheet I nk D. RVIS.

STEAM GENERATOR. (Application med Feb. 2o, 1902.1, (No Model.)

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0. D. ORVIS.

-STEAM GENERATOR. (Application ma Feb. 2e, 1902.)

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'STEAM GEMERAToR.

(ppution med Feb. 2e, 1962.) (No Model.) l 3 Sheet's-Sheet 3.

UNITED STATES PATENT rrrcn.

OREL D. ORVIS, OF NEW YQRK, N. Y.

STEAM-GENERATOR. I

SPECIFICATION forming part of Letters '.Patent No. 704,571, dated July 15, 1902.

Application filed February 26, 1902. Serial No. 95,679. (No model.)

To all whom, it may concern.:

Be it known that I, OREL D. ORV'IS, a citizen of the United States, residing in the borough of Manhattan, city of New York, county of New York, and State of NewYork, have in vented certain new and useful Improvements in Steam-Generators, of which the following is a specification.

This invention relates to steam-generators, its objects being to increase and perfect the combustion of the furnace-gases and to establish a rapid and constant circulation'of water throughout the boiler system. Animportant feature is the special shaping and arrangement of the generating-tubes whereby leaking at the joints and connections due to expansion is practically obviated.

In the application of the invention two bridge-walls are employed beneath the boiler. The first bridge-wall supports the back of a continuous grate extending across the width of the furnace. The second `bridge-wall is located between the first bridge-wall and the back of the furnace and forms the back of a chamber into which the combustion products of the grate-chamber are allowed to pass. The water-tubes extend longitudinally from the front wall to the rear of the furnace and between the furnace-grate and the bottom of the boiler and are supported by both bridgewalls.

Referring now to the accompanying drawings, Figure 1 designates a verticallongitudinal section of a steam-generator, showing an application of the invention. Fig. 2 is a vertical transverse section on the line 2 2 of Fig. l. Fig. 3 is a vertical transverse section on the line 3 3 of Fig. l. Fig. l is a horizontal longitudinal section on the line 4 4t of Fig. l.

A is a fire-tube boiler supported by the side walls B B, the front wall C, and the iirst bridge-wall F.

D is the rear wall of the furnace, and G is the second bridge-wall.

7L 71. are water-tubes arranged a suitable distance apart in two horizontal series and partly covered with a suitable refractory material i i, such as fire-brick, and forming over the chamber J water-tube mantles. These water-tube mantles extend inwardly from the side walls B B and are separated by the space I. The watertubes 7L h are mantled only headers L L are located at or in the front wall C and are connected with the waterspace in the boiler by the tubes N N. The headers MM rest upon or in recesses V V in the rear of the bridge-wall G and are connected with the water-space in the boiler by the bent tubing P P.

Q Q are the blow-off pipes.

1 S showsthe grate-bars, beneath which air is admitted to the furnace. The brick-supports R R (see Fig. 2) upon the first bridgewall F give support to the'water-tubes and their mantles and provide a passage for the flame and furnace-gases to pass over the top of the first bridge-Wall and under the watertube mantles, the greatest concentrated volume passing directly up between the watertube mantles and striking the lower central portion of the shell of the boiler. l These gases mingle in the second chamber, passing out between the water-tube mantles and over the second bridge-wall to the return-tubes of the boiler and iinally into the smoke-stack.

As shown in Fig. l, the water-tubes h hare preferably in a position substantially hori- Zontal and parallel with the fire-grate and at a sufficient distance above the grate to permit of convenient iiringand manipulation. These tubesterminating at their rear ends in the headers M M are free to expand backward from the second bridge-wall Gr into the rear chamber T. The joints of the tubing are protected from the action of the fire by masonry, and the strained effect caused by the expan-` sion ofthe tubes is taken up in the bow or bend in each ofthe tubes P P. The tubes P P should be formed of seamless steel tubing, bentinto the required shape to allow for eX- pansion and contraction. This arrangement obviates the necessity of exposing joints and connections to the action of the lire.

To illustrate the invention, the simplest kind of a bend is given to the tubes P P, and tubes bent in this manner will allow for con siderable expansion without the slightest in jury to the joints and connections; but it should be observed that many other forms of tubing embodying this principle could be used and such forms may be preferable for generators constructed dierently from the one shown in the drawings. The drawings also show only two sets of parallel water-tubes h h, forming a central longitudinal dame-passage; but it may be found convenient to increase the number of sets of tubes or to arrange the individual tubes or their respective sets in a manner not strictly parallel.

Owing to the inclined positionof the watertubes h h from the rear to the front of the furnace, a constant circulation of water is produced, the water leaving the boiler by the tubes P P, traversing the tubes h h, and thence into the boiler by the tubes N N. With this arrangement the coldest water, which stays at the bottom of the boiler, is brought into contact with the-greatest heat of the furnace through the tubing h h and upon rentering the boiler ascends to the surface,

. thus augmenting circulation.

The blowing-off tubes QQ are connected to the rear water-tube headers M'M, an arrangement by which the entire water-circuit may be cleared from sediment.

Though I have shown and prescribed definite arrangements for carrying out the general principles of this invention, it will be seen that many modifications may be made without departing from the spirit of the invention. l

What I claim as my invention, and desire to secure by Letters Patent, is

l. In a steam-generator, a furnace containing two bridge-walls, a continuous grate extending across the width of the front of the furnace, sets of water-tubes extending longitudinally from the front of the furnace to or beyond the second bridge-wall and inwardly from the opposite sides of the furnace forming an intermediate longitudinal space for the passage and direction of the greatest volurne of flame and furnace-gases against the boiler; said sets of tubes being mantled over the chamber formed between the first bridgewall and the second bridge-wall, and connections of said sets of water-tubes with the front and rear of the boiler for the purposespeci.

volume of the ame and furnace-gases against the boiler;I said sets of. water-tubes mantled over the chamber formed between the first bridge-wall and the second bridge-wall, headers located at the front wall of the furnace connecting the front ends of said sets of water-tubes and connections between said headyers and thewater-space in the boiler, and headers located in a recess in or behind the second bridge-wall connecting the rear ends of said sets of water-tubes and bent or bowed tubular connections between said headers and the Water-space in the boiler substantially as and for the purpose set forth.

3. In a steam-generator, the combination of a furnace containing two bridge-walls, a continuous grate extending across the width of the front of the furnace, sets of Water-tubes extending longitudinally from the front of the furnace to or beyond the second bridgewall, means of support for said sets of watertubes upon the first bridge-wall and connec tions of said sets of water-tubes with the front and rear of the boiler for establishing water circulation.

4. A steam-generator comprising a furnace containing two bridge-walls, a continuous grate extending across the width of the front of the furnace, sets of water-tubes extending longitudinally from the front of the furnace to or beyond the second bridge-wall, means of support for said sets of water-tubes upon the rst bridge-wall, mantles or coverings upon said sets of water-tubes located over the chamber formed between the first bridge-wall and the second bridge-wall and connections of said sets of water-tubes with the front and rear of the boiler substantially as and for the purpose described and illustrated.

5. A steam-generator comprising a furnace containing two bridge-walls, a continuous grate extending across the width of the front ofthe furnace, sets of water-tubes extending longitudinally from the front of the furnace to or beyond the second bridge-wall, mantles or coverings upon said sets of water-tubes lo.- cated over the chamber formed between the first bridge-wall and the second bridge-wall, means of support for said sets of water-tubes and their mantles upon the first bridge-wall, headers located at the front wall of the furnace connecting the front ends of said sets of water-tu'besand headers located at the sec- IIO ond bridge-wall connecting the rear ends of said sets of water-tubes and connection of said for said sets of water-tubes upon the first v bridge-wall, headers located at the front Wall of the furnace connecting the front ends of said sets of water-tubes and connections between said headers and the water-space in the boiler and headers located at the second my hand in the presence of two subscribing bridge-wall connecting the rear ends of said witnesses. sets of water-tubes and bent or bowed tnbular Connections between said headers and the 5 Water-space in the boiler substantially as set Witnesses:

forth. JAMES A. CONNOLLY,

In testimony whereof I have hereunto set O. Gr. SOHAEFER.

OREL D. ORVIS. 

